On July 1, 2022, Berkshire Hathaway completed its acquisition of Alleghany Corporation. Warren Buffett had described the transaction as an opportunity to acquire a quality business in the property and casualty insurance market. The approximately $11.6 billion deal marked a new chapter for Alleghany under the Berkshire Hathaway umbrella.

In late 2021, Alleghany Corporation increased its investment footprint in the technology sector by contributing capital to ORX Genomics. This move was seen as a push to leverage cutting-edge technology in their operational strategy, signaling a forward-thinking approach to innovation in insurance.

On May 15, 2020, Alleghany Corporation announced new initiatives to enhance its commitment to Environmental, Social, and Governance (ESG) principles. By integrating ESG considerations into their business practices, Alleghany aimed to promote sustainability and responsible governance across their operations.

In March 2017, Alleghany Corporation began expanding its reach into the specialty insurance sector through its subsidiary CapSpecialty. This expansion was aimed at growing Alleghany's presence in niche insurance markets and capturing new business opportunities in a competitive industry.

In early 2016, Alleghany Corporation undertook a restructuring of its business segments to better align with its strategic goals. This reorganization saw the company focusing more on its core insurance and reinsurance operations, while also making adjustments to streamline other segments. This move was intended to enhance efficiency.

On June 18, 2014, Alleghany Corporation announced an investment in Ares Management, a global alternative asset manager. This investment was part of Alleghany's strategy to diversify its portfolio and enhance its exposure to alternative investments. The partnership provided Alleghany with further opportunities for financial growth and stability.

Alleghany Corporation acquired Transatlantic Holdings, a specialty reinsurance company, on November 21, 2011. This acquisition was a strategic move to strengthen Alleghany's position in the reinsurance market. The deal was valued at approximately $3.4 billion and indicated a commitment to growing its insurance operations.

On October 28, 2002, Alleghany Corporation announced a strategic decision to focus more on its insurance businesses. This was highlighted by its acquisition of Imperial Credit Industries Inc. and the insurance company Darwin Professional Underwriters, which helped position Alleghany as a key player in the insurance industry.

In 1984, the First Eagle Trust acquired a controlling interest in Alleghany Corporation. This acquisition marked a pivotal moment in Alleghany's history, as it signaled a shift from its original focus on railroads to becoming a diversified holding company involved in various sectors, including insurance and finance.

Alleghany Corporation was founded on December 11, 1929. It was originally formed as a holding company for railroad assets. Its creation was a significant event during a time of significant change and consolidation in the transportation industry, particularly following the economic impacts of the Great Depression and prior financial panics.